2022年英语专四听力dictation备考训练(97)

2021-11-24 17:38:00来源:网络

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  Controlling Cancer

  There are two main causes of cancer, heredity and environment. We can do

  nothing to change our heredity, that is, the basic physical characteristics that

  were passed on to us by our parents. However, we can do a great deal to control

  our environment, which may account for 80%-90% of all cancers.

  Environmental pollution can be divided into two kinds: personal and

  nonpersonal. Personal pollution may be defined roughly as unhealthy habits such

  as smoking, drinking, and eating the wrong foods. Clearly, with enough will

  power we can control this personal environment.

  Nonpersonal pollution, on the other hand, refers to those things which are

  beyond our individual control. One example would be industrial pollution, which

  is very hard to control because of the expense involved. It would be expensive

  in terms of profits and perhaps jobs. The American automobile industry, for

  example, resisted the law requiring smog-control devices because it feared the

  added expense would reduce profits. Nevertheless, some laws protecting the

  environment have been quite successful in reducing pollution.

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